Observation of long range correlation dynamics in BaTiO3 near TC by photon correlation spectroscopy

Rui Yan; Zhi Guo; Renzhong Tai; Hongjie Xu; Xiangyong Zhao; Di Lin; Xiaobing Li; Haosu Luo
November 2008
Applied Physics Letters;11/10/2008, Vol. 93 Issue 19, p192908
Academic Journal
Long range correlation dynamics of polarization clusters in BaTiO3 have been observed directly near the Curie temperature (TC) by photon correlation spectroscopy. A correlation length on the order of 200 nm was found to be dynamic near TC with a characteristic relaxation time of several microseconds. This relaxation time decreased with an increase in temperature, but exhibited an anomaly at TC, indicating the dominating contribution to the dielectric permittivity by these polarization clusters near TC.


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